| Message ID | 1612817879-21511-1-git-send-email-eric.devolder@oracle.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | acpi: Error Record Serialization Table, ERST, support for QEMU | expand |
Hi, A friendly request to review and/or provide feedback on this patchset. Thanks, eric
I tagged this for after the release. To help make sure I don't lose this by mistake please ping after the QEMU release. Thanks! On Mon, Mar 01, 2021 at 07:04:50PM +0000, Eric Devolder wrote: > Hi, > A friendly request to review and/or provide feedback on this patchset. > Thanks, > eric > ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ > From: Eric Devolder <eric.devolder@oracle.com> > Sent: Monday, February 8, 2021 2:58 PM > To: mst@redhat.com <mst@redhat.com>; imammedo@redhat.com <imammedo@redhat.com>; > marcel.apfelbaum@gmail.com <marcel.apfelbaum@gmail.com>; pbonzini@redhat.com > <pbonzini@redhat.com>; rth@twiddle.net <rth@twiddle.net>; ehabkost@redhat.com > <ehabkost@redhat.com>; qemu-devel@nongnu.org <qemu-devel@nongnu.org> > Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>; kwilk@oracle.com > <kwilk@oracle.com> > Subject: [PATCH v2 0/7] acpi: Error Record Serialization Table, ERST, support > for QEMU > > This patchset introduces support for the ACPI Error Record > Serialization Table, ERST. > > Linux uses the persistent storage filesystem, pstore, to record > information (eg. dmesg tail) upon panics and shutdowns. Pstore is > independent of, and runs before, kdump. In certain scenarios (ie. > hosts/guests with root filesystems on NFS/iSCSI where networking > software and/or hardware fails), pstore may contain the only > information available for post-mortem debugging. > > Two common storage backends for the pstore filesystem are ACPI ERST > and UEFI. Most BIOS implement ACPI ERST; however, ACPI ERST is not > currently supported in QEMU, and UEFI is not utilized in all guests. > By implementing ACPI ERST within QEMU, then the ACPI ERST becomes a > viable pstore storage backend for virtual machines (as it is now for > bare metal machines). > > Enabling support for ACPI ERST facilitates a consistent method to > capture kernel panic information in a wide range of guests: from > resource- constrained microvms to very large guests, and in > particular, in direct-boot environments (which would lack UEFI > run-time services). > > Note that Microsoft Windows also utilizes the ACPI ERST for certain > crash information, if available. > > The ACPI ERST persistent storage is contained within a single backing > file, with a default size of 64KiB. The size and filename of the > backing file can be obtained from QEMU parameters. > > The ACPI specification[1], in Chapter "ACPI Platform Error Interfaces > (APEI)", and specifically subsection "Error Serialization", outlines > a method for storing error records into persistent storage. > > [1] "Advanced Configuration and Power Interface Specification", > version 6.2, May 2017. > https://www.uefi.org/sites/default/files/resources/ACPI_6_2.pdf > > [2] "Unified Extensible Firmware Interface Specification", > version 2.8, March 2019. > https://uefi.org/sites/default/files/resources/UEFI_Spec_2_8_final.pdf > > Suggested-by: Konrad Wilk <konrad.wilk@oracle.com> > Signed-off-by: Eric DeVolder <eric.devolder@oracle.com> > > --- > v2: 8feb2021 > - Added qtest/smoke test per Paolo Bonzini > - Split patch into smaller chunks, per Igo Mammedov > - Did away with use of ACPI packed structures, per Igo Mammedov > > v1: 26oct2020 > - initial post > > --- > Eric DeVolder (7): > ACPI ERST: bios-tables-test.c steps 1 and 2 > ACPI ERST: header file for erst > ACPI ERST: support for ACPI ERST feature > ACPI ERST: build step for ACPI ERST > ACPI ERST: support ERST for x86 guest > ACPI ERST: qtest for ERST > ACPI ERST: bios-tables-test.c step 5 > > hw/acpi/erst.c | 952 +++++++++++++++++++++++++++++++++++++++++++ > hw/acpi/meson.build | 1 + > hw/i386/acpi-build.c | 4 + > include/hw/acpi/erst.h | 77 ++++ > tests/data/acpi/microvm/ERST | 0 > tests/data/acpi/pc/ERST | Bin 0 -> 976 bytes > tests/data/acpi/q35/ERST | Bin 0 -> 976 bytes > tests/qtest/erst-test.c | 106 +++++ > tests/qtest/meson.build | 2 + > 9 files changed, 1142 insertions(+) > create mode 100644 hw/acpi/erst.c > create mode 100644 include/hw/acpi/erst.h > create mode 100644 tests/data/acpi/microvm/ERST > create mode 100644 tests/data/acpi/pc/ERST > create mode 100644 tests/data/acpi/q35/ERST > create mode 100644 tests/qtest/erst-test.c > > -- > 1.8.3.1 >
On Mon, Feb 08, 2021 at 03:57:52PM -0500, Eric DeVolder wrote: > This patchset introduces support for the ACPI Error Record > Serialization Table, ERST. OK I'm expecting v3 I guess? > Linux uses the persistent storage filesystem, pstore, to record > information (eg. dmesg tail) upon panics and shutdowns. Pstore is > independent of, and runs before, kdump. In certain scenarios (ie. > hosts/guests with root filesystems on NFS/iSCSI where networking > software and/or hardware fails), pstore may contain the only > information available for post-mortem debugging. > > Two common storage backends for the pstore filesystem are ACPI ERST > and UEFI. Most BIOS implement ACPI ERST; however, ACPI ERST is not > currently supported in QEMU, and UEFI is not utilized in all guests. > By implementing ACPI ERST within QEMU, then the ACPI ERST becomes a > viable pstore storage backend for virtual machines (as it is now for > bare metal machines). > > Enabling support for ACPI ERST facilitates a consistent method to > capture kernel panic information in a wide range of guests: from > resource- constrained microvms to very large guests, and in > particular, in direct-boot environments (which would lack UEFI > run-time services). > > Note that Microsoft Windows also utilizes the ACPI ERST for certain > crash information, if available. > > The ACPI ERST persistent storage is contained within a single backing > file, with a default size of 64KiB. The size and filename of the > backing file can be obtained from QEMU parameters. > > The ACPI specification[1], in Chapter "ACPI Platform Error Interfaces > (APEI)", and specifically subsection "Error Serialization", outlines > a method for storing error records into persistent storage. > > [1] "Advanced Configuration and Power Interface Specification", > version 6.2, May 2017. > https://www.uefi.org/sites/default/files/resources/ACPI_6_2.pdf > > [2] "Unified Extensible Firmware Interface Specification", > version 2.8, March 2019. > https://uefi.org/sites/default/files/resources/UEFI_Spec_2_8_final.pdf > > Suggested-by: Konrad Wilk <konrad.wilk@oracle.com> > Signed-off-by: Eric DeVolder <eric.devolder@oracle.com> > > --- > v2: 8feb2021 > - Added qtest/smoke test per Paolo Bonzini > - Split patch into smaller chunks, per Igo Mammedov > - Did away with use of ACPI packed structures, per Igo Mammedov > > v1: 26oct2020 > - initial post > > --- > Eric DeVolder (7): > ACPI ERST: bios-tables-test.c steps 1 and 2 > ACPI ERST: header file for erst > ACPI ERST: support for ACPI ERST feature > ACPI ERST: build step for ACPI ERST > ACPI ERST: support ERST for x86 guest > ACPI ERST: qtest for ERST > ACPI ERST: bios-tables-test.c step 5 > > hw/acpi/erst.c | 952 +++++++++++++++++++++++++++++++++++++++++++ > hw/acpi/meson.build | 1 + > hw/i386/acpi-build.c | 4 + > include/hw/acpi/erst.h | 77 ++++ > tests/data/acpi/microvm/ERST | 0 > tests/data/acpi/pc/ERST | Bin 0 -> 976 bytes > tests/data/acpi/q35/ERST | Bin 0 -> 976 bytes > tests/qtest/erst-test.c | 106 +++++ > tests/qtest/meson.build | 2 + > 9 files changed, 1142 insertions(+) > create mode 100644 hw/acpi/erst.c > create mode 100644 include/hw/acpi/erst.h > create mode 100644 tests/data/acpi/microvm/ERST > create mode 100644 tests/data/acpi/pc/ERST > create mode 100644 tests/data/acpi/q35/ERST > create mode 100644 tests/qtest/erst-test.c > > -- > 1.8.3.1
Michael, Yes, I'm working on a v3 to accommodate items Igor has requested. eric
This patchset introduces support for the ACPI Error Record Serialization Table, ERST. Linux uses the persistent storage filesystem, pstore, to record information (eg. dmesg tail) upon panics and shutdowns. Pstore is independent of, and runs before, kdump. In certain scenarios (ie. hosts/guests with root filesystems on NFS/iSCSI where networking software and/or hardware fails), pstore may contain the only information available for post-mortem debugging. Two common storage backends for the pstore filesystem are ACPI ERST and UEFI. Most BIOS implement ACPI ERST; however, ACPI ERST is not currently supported in QEMU, and UEFI is not utilized in all guests. By implementing ACPI ERST within QEMU, then the ACPI ERST becomes a viable pstore storage backend for virtual machines (as it is now for bare metal machines). Enabling support for ACPI ERST facilitates a consistent method to capture kernel panic information in a wide range of guests: from resource- constrained microvms to very large guests, and in particular, in direct-boot environments (which would lack UEFI run-time services). Note that Microsoft Windows also utilizes the ACPI ERST for certain crash information, if available. The ACPI ERST persistent storage is contained within a single backing file, with a default size of 64KiB. The size and filename of the backing file can be obtained from QEMU parameters. The ACPI specification[1], in Chapter "ACPI Platform Error Interfaces (APEI)", and specifically subsection "Error Serialization", outlines a method for storing error records into persistent storage. [1] "Advanced Configuration and Power Interface Specification", version 6.2, May 2017. https://www.uefi.org/sites/default/files/resources/ACPI_6_2.pdf [2] "Unified Extensible Firmware Interface Specification", version 2.8, March 2019. https://uefi.org/sites/default/files/resources/UEFI_Spec_2_8_final.pdf Suggested-by: Konrad Wilk <konrad.wilk@oracle.com> Signed-off-by: Eric DeVolder <eric.devolder@oracle.com> --- v2: 8feb2021 - Added qtest/smoke test per Paolo Bonzini - Split patch into smaller chunks, per Igo Mammedov - Did away with use of ACPI packed structures, per Igo Mammedov v1: 26oct2020 - initial post --- Eric DeVolder (7): ACPI ERST: bios-tables-test.c steps 1 and 2 ACPI ERST: header file for erst ACPI ERST: support for ACPI ERST feature ACPI ERST: build step for ACPI ERST ACPI ERST: support ERST for x86 guest ACPI ERST: qtest for ERST ACPI ERST: bios-tables-test.c step 5 hw/acpi/erst.c | 952 +++++++++++++++++++++++++++++++++++++++++++ hw/acpi/meson.build | 1 + hw/i386/acpi-build.c | 4 + include/hw/acpi/erst.h | 77 ++++ tests/data/acpi/microvm/ERST | 0 tests/data/acpi/pc/ERST | Bin 0 -> 976 bytes tests/data/acpi/q35/ERST | Bin 0 -> 976 bytes tests/qtest/erst-test.c | 106 +++++ tests/qtest/meson.build | 2 + 9 files changed, 1142 insertions(+) create mode 100644 hw/acpi/erst.c create mode 100644 include/hw/acpi/erst.h create mode 100644 tests/data/acpi/microvm/ERST create mode 100644 tests/data/acpi/pc/ERST create mode 100644 tests/data/acpi/q35/ERST create mode 100644 tests/qtest/erst-test.c